Starting crank for explosion engines locked against back rotation



M. HARKE Jain. 10, 1928.

STARTING CRANK FOR EXPLOSION ENGINES LOCKED AGAINST BACK ROTATION Filed May 18. 1926 tit? Patented clan it] i938.

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as: nacn Application filed Itta y ltt, lt fttd, t'ierial lltoi ltflfitla, and in ttcrniany litarch race lhis invention relates to a starting crank tor explosion engines oi any type Which loclred against bach rotation and in. which the shatt or the apparatus connected With the motor shait bl claw--coupling has a recess with which engages a catch element movably mounted in catchbcdy rotated with the cranlr and designed to couple the crank and the shaft tor starting the motor. 'll his catchor coupling-element is however disengaged immediately it the direction oit rotation ot the motor shaft changes owing to advance ignition the disengaging; being etlected by means oi a stop tired on a ro tarybod v supported on the motor casing so that it cannot participate in this bach rotating; inovenient.

According to the invention a roller shaped catch element engages through a slot in the catch body ot the crank with a recess ot the shaft ot the apparatus and is guided in recess ot a link which is connected With a rotating body loclred against haclnrotat ing, the bearingpoints oi the roller-shaped catch or clutch-element on the three enclosting bodies being selected in such a manner, that the resultant oi the pressure enerted by the cranh handle-catch and ot' the pressure produced by the resisting shaft of the apparatus acts perpendicularly upon the linkhody so that no rotating moment is enerted upon this linlnbody and the coupiing; element is wedged in its clutch position and ensures thus a rigid coupling at the starting inovenient between the linlnhody, crank catch and shatt oi the apparatus At abaclr rotation oil the shal't ot the apparatus due to advanced ignition said catch-elementis liited out by the recess in the back-sliding shatt and pushed. back into the slot ot the hole The connection between the crank catch and the link body may have play depending; on the rolling inovenientoi the catch ele rnent hctween the three bodies said play being ensured tor instance b means ot a stud. guided in a slot, so that the crank can. at advancing ignition, inove baclr only for the length of this play,

An embodiment of the invention is shown, by way" of esainple in the accompanying drawing in which Fig. it shows the starting cranlr in cross section liig. it a longitudinal section at Fig. ll

l ia' 5 shows the measure directions dun his the r d COlltJlllltl oi the bodies .del to the drawing as 1s the shait the apparatus adapted to be coupled with the motor Slit by means ot a claw couplint The crass handle is mounted on a catch body 7) which is for instance of square cross section. .lhe crank-catch bodv b is ro- 'tatabljv or slidinglp connected by a nipple or lip to a ring nut c with. a support (3 fixed hpineans oft screw threads on the motor casing. it. link bod c is loosely mounted on shatt wand enclosed between the catch body a and the siupport cl bearing-rollers y" serving to guide the link bod c on a flange ot the support (in (living to the slots 9 in which the bearing-rollers g are located this ring-sl l linlt bodv c can rotate only in thestar g direction but is stopped, as soon as the direction ct movement is reversed. this lint; body c has a slot-shaped recess is c' is located 'lhis in which a catch roller catch roller ".5 engages further, through a slot in the sleeve d3 oi the catch bod v l), with a recess Z in the shaft a It the apparatus its shown in his; 3 the pressure exerted by the catch sleeve it upon the catch roller 1i acts in the direction ot the arrow 0. The pressure exerted upon the catch roller 25 by the resisting shait 0: acts in the direction oi the arrow p. l roin these two pressure directions results a resultant indicated. bv the arrow 9. lit this resultant 9' acts perpendicularly upon the linlr body e no turning inoinent enerted upon the catch roller 2' and the catch roller E is merely supported by thesleeva The catch roller is consequentlv wedged between thebodies a. h and e and a rigid connection is produced between these three bodies so that by the sleeve it: ot the crank catch 5 the shaft 05 ot the apparatus as well as the link body e and the catch roller a" wedged between the same inav be drawn along to inalre the motor shat't start it, owing to advanced ignition, the nor and direction 0t rotation ct shalt a indicated by an arrow in l ipgs. i and it should be reversed, this shalt a will, in consequence ot the shape of its recess Z push the catclrroller i upward into the recess it ot the linlr body c, which, owing; to the rollers i g beinp; loclred against ba ch-rotation, is itselt secured against back rotation It is advisable to give slight play for the catch sleeve it; ot the cranlr and the link tlti body e through the arrangement of a slot n and a catch pin m, this play being great enough to carry through entirely or partly the rolling movement of the catch-roller i out of the range of the recess Z of shaft a. The backward rotation of crank catch body I) and consequently of the crank can be considerably reduced by this slot as the catchroller t' is squeezed out of the gap very rapidly as soon as it has been slightly lifted out of the wedged position, the crank catch sleeve is and the link body 6 being capable only of a very limited mutual rotation.

For regulating the direction of the energy to a stationary position of the link body 0 s ecial auxiliary means may be used, the link ody 6 being for instance arranged for intercepting small turning moments which might occur, this intercepting being due to adjustable braking pressure.

I claim 1. A starting crank for explosion engines locked against back rotation, comprising in combination with the motor shaft, a shaft for the crank. handle, said shaft having a recess, a catch body rigidly connected with said crank handle, a catch roller movably mounted in said catch body, a support fixed on the engine casing, a link-body mounted in said support casing and having a slotthrough which said catch rollcr engages with said recess of said shaft and recesses in the face engaging with said support, bearing rollers one in each short recess for locking said link body against back rotation.

A starting crank for explosion engines locked against back rotation, comprising in combination with the motor shaft, a shaft for the crank handle, said shaft having a recess, a catch body rigidly connected with said crank handle, a catch roller movably mounted in the link, a support fixed on" the engine casing, a sleeve mounted in said support casing and having a slot through which said catch roller engages with said recess of the shaft of the apparatus and two short recesses in the face engaging with said support, and bearing rollers one in each short recess for locking said link body against back rotation, and a pin of said crank-catch body guided in a slot of said link bodyio connect said link body with play with said crank catch.

In testimony whereof I afiix my signature.

MAX HARKE. 

